<template>
  <div>
    <div class="todo-footer">
      <label>
        <input type="checkbox" v-model="isAllcheck"/>
      </label>
      <span>
        <span>已完成{{ addDone }} </span>
        / 全部{{ todos.length }}
      </span>
      <button class="btn btn-danger" @click="deleteIdAll">清除已完成任务</button>
    </div>
  </div>
</template>


<script>
export default {
  name:"Footer",
  props:["deleteIdAll","todos","changeAllDone"],
  computed:{
      //统计选中的个数
      addDone(){
        return this.todos.reduce((p,c)=>{
          if(c.done){
            p++
          }
          return p;
        },0)
      },
      isAllcheck:{
        get(){
          console.log("getter")
          return this.addDone === this.todos.length && this.todos.length
        },
        set(newVal){
          console.log(newVal)
          this.changeAllDone(newVal)
        }
      }
    }
}
</script>


<style>
/*footer*/
.todo-footer {
  height: 40px;
  line-height: 40px;
  padding-left: 6px;
  margin-top: 5px;
}

.todo-footer label {
  display: inline-block;
  margin-right: 20px;
  cursor: pointer;
}

.todo-footer label input {
  position: relative;
  top: -1px;
  vertical-align: middle;
  margin-right: 5px;
}

.todo-footer button {
  float: right;
  margin-top: 5px;
}
</style>